Spark-plug.



H. L. BROWNBACK.

SPARK PLUG.

APPLIOATION FILED JAN. 15, 1908.

Patented Dec. 15, 1908.

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HENRYiLOWE B ROWNBACK, OF NORRISTOWN, PENNSYLVANIA.

. v Y SPARK-PLUG.

Specification of Letters Patent. Application led January 15, 15508. Serial No. 411,006.

Patented nec. 15, 1908.

To all whom it may concern.'

Be itV known that I, HENRY LOWE BROWN- BACK, a citizen of the United States, residing at Norristown, in the county of Montgomery and State of Pennsylvania, have invented new and useful Im rovements in Spark- P lugs, of which the following is a specification.

This invention relates to s ark plugs for explosive engines, and lone of) obJects of the same is to rovide a plug of simple construction in w ich the gap lbetween the sparking points may be regulated in a moment while the'engine is warmed up thus obviating the annoyance of. having to ascertain what is the matter when the spark points have been improperly adjusted so that they will not work.

Another object of the invention is to provide a double sparking point with means for turning one point or the other into operative position so that when one of the points becomes corroded and inoperative the other point may be readily adjusted to the required operative position.

ln many instances a foreign substance like oil, water, gasolene, soot or carbon gets between the points and interferes with the operation.' By means of ymy double points this defect may be overcome by adjusting the other point in proper position.

The above andother .objects may be attained by means of the construction illustrated in the accompanying drawing, in which,-

Figure 1 is a longitudinal section taken through a vspark plug made in accordance with my invention. Fi 2 is a ytransverse section on the line 2 2, ig. 1, looking in the direction indicated b the arrows.

Referring to the rawing for a more speciiic description of my invention, the numeral 1 designates a porcelain insulator having a centrallongitudinal bore 2, and the lower end of said insulator bein recessed, as

at 3, to form asparking cham er. A c entral electrode 4 extends through the insulator` 1 and is provided with screw threads at its upper end. The electrode extends through a copper washer 5 and through an insulated nut 6 and is provided with a nut 7 the principal which holds the terminal 8 in place between it and the insulator 9. cotter pin 10 is passed through the upper end of theelectrode 4, and the lower end of said electrode is reduced in size, as at 11, and the terminal lower end is bent outwardly, as at 12, and downwardly, as at 13. The electrode passes through a copper asbestos lined gasket 14, and the insulatory 9 may also be formed of copper with an asbestos lining. A double sparking point a, b is attached to the lower end of the electrode 4in line with sparking points extending in op osite directions from the terminus of a fixedp arm C, which is vconnected to the outer shell 15, said shell being provided with screw threads 16 for attachment to the engine and also provided with a nut 17 which engages the interior screw threads at the upper end ofthe outer shell, said nut having its lower end bearing against` a rubber washer 18 which surrounds the insulator l, said washer serving to hold the outer shell closely by friction to said insulator 1.

' Whenever it is found necessary to change the sparking points the electrode isA turned v can be manufactured at comparatively slight cost and hasy various advantages over the spark plugs now in use.

Having thusdescribed the invention, what is claimed as new, is l A lspark plug comprising a shell formed with a' fixed arm projecting within the shell, a plurality of s arking points projecting 1n opposite directlons from the terminus of said arm, a non-conductin plug arranged within the shell and forme with a longitudinally disposed bore, an electrode extending through the bore and formed with a circumferentlally reduced end, the terminal of said reduced end being bent into'crank form with the end., portion thereof depending within the shell approximately in horizontal alinetions from the free end of the or 5 of the electrodelwithin the p1u'g,

relativepositions of the respective arm, :mdsJ phirlity ofY ating in opposite direcank portion,

the fixed arm preventing complete rotation wherebg the xe and movable sparking points may be determined.

In testimony whereof I aix my signature 1n presence of two witnesses.

HENRY BROWNBAQK.

Witnesses: e

HENRY C. BBOWNBACK; FANNIE L. ROBERTS. y 

